[support] Possible to set default input format based on role?

Hello, In Drupal 5.1, is it possible to set the default input format for specific roles? Basically, I've got a role setup for content editors on the site. For them, I'd like to allow pretty much full html. For anonymous users, I don't want to allow any. All they'll be doing is posting comments anyway. Is this possible to do? I know I can have users select the input format for each one, but I'd like to set defaults for specific roles. - jody